Fixing check for NDK environment.
Fixing check for NDK environment.

Change-Id: I3d1a8bf2b2647c9304184fcca3f45824e0a04c3c

claywilkinson/play-games-plugin-for-unity,claywilkinson/play-games-plugin-for-unity,claywilkinson/play-games-plugin-for-unity,claywilkinson/play-games-plugin-for-unity